A new approach to trenching experiments for measuring root–rhizosphere respiration in a lowland tropical forest

Sayer, Emma J.

doi:10.1016/j.soilbio.2009.11.014

Cited by 60 publications

(49 citation statements)

References 37 publications

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“…(Subke et al 2006). Sayer and Tanner (2010) estimated that the decomposition of residual roots dominated SRh over 7 months after trenching in a tropical moist forest of Panama. Given that organic matter decay rates are lower in peat swamp forests than in other types of tropical rainforests (Yule and Gomez 2009) we allowed 1 year to pass after trenching before starting collecting CO 2 efflux data and assume that residual root decomposition contributed little to belowground respiration at the beginning of the experiment.…”

Section: Discussionmentioning

confidence: 99%

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Total and heterotrophic soil respiration in a swamp forest and oil palm plantations on peat in Central Kalimantan, Indonesia

et al. 2017

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Heterotrophic respiration is a major component of the soil C balance however we critically lack understanding of its variation upon conversion of peat swamp forests in tropical areas. Our research focused on a primary peat swamp forest and two oil palm plantations aged 1 (OP2012) and 6 years (OP2007). Total and heterotrophic soil respiration were monitored over 13 months in paired control and trenched plots. Spatial variability was taken into account by differentiating hummocks from hollows in the forest; close to palm from far from palm positions in the plantations. Annual total soil respiration was the highest in the oldest plantation (13.8 ± 0.3 Mg C ha -1 year -1 ) followed by the forest and youngest plantation (12.9 ± 0.3 and 11.7 ± 0.4 Mg C ha , respectively). In contrast, the contribution of heterotrophic to total respiration and annual heterotrophic respiration were lower in the forest (55.1 ± 2.8%; 7.1 ± 0.4 Mg C ha -1 year -1 ) than in the plantations (82.5 ± 5.8 and 61.0 ± 2.3%; 9.6 ± 0.8 and 8.4 ± 0.3 Mg C ha -1 year -1 in the OP2012 and OP2007, respectively). The use of total soil respiration rates measured far from palms as an indicator of heterotrophic respiration, as proposed in the literature, overestimates peat and litter mineralization by around 21%. Preliminary budget estimates suggest that over the monitoring period, the peat was a net C source in all land uses; C loss in the plantations was more than twice the loss observed in the forest.

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Section: Discussionmentioning

confidence: 99%

“…Considering the possibility of reinvasion of roots into root-free zones (Sayer and Tanner 2010) we recut the trenches in December 2013 (one and half year after initial trenching) at the forest and OP2012 sites. Retrenching was not conducted at the OP2007 due to refusal by the owner who was concerned about potential damage to the plantation.…”

Section: Study Sitesmentioning

confidence: 99%

Total and heterotrophic soil respiration in a swamp forest and oil palm plantations on peat in Central Kalimantan, Indonesia

et al. 2017

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“…A third significant source of CO 2 from anoxic wetlands is the oxidation of CH 4 driven by radial oxygen loss from root systems (Hoyos-Santillan et al 2016a) and aerobic surface peat (Jauhiainen 2005;Wright et al 2013a). Terms applied to describe this combination of processes include ''root-rhizosphere respiration'' (Sayer and Tanner 2010), ''root respiration'' (Andrews et al 1999), ''rhizosphere respiration'', and ''root-derived CO 2 '' (Kuzyakov and Larionova 2005). We adopt the latter term because it most accurately describes the combination of processes associated with CO 2 production from roots and the methods by which it is calculated.…”

Section: Introductionmentioning

confidence: 99%

“…A study of root-derived CO 2 in Tabebuia heterophylla dominated secondary forest in Puerto Rico estimated 70% compared to 56% in a nearby Pinus caribaea plantation (Li et al 2004). Lower values of root-derived CO 2 include 39% and 58-77% in mature secondary lowland tropical forest in Panama (Nottingham et al 2010;Sayer and Tanner 2010), and 16-24% measured in two Eucalyptus plantations in Brazil over a 3 month period (Binkley et al 2006). No studies could be found that had estimated root-derived CO 2 in Panamanian peatlands, despite the critical role of plant inputs in regulating net efflux.…”

Section: Introductionmentioning

confidence: 99%

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Root-derived CO2 flux from a tropical peatland

Girkin

Turner

Ostle

et al. 2018

Wetlands Ecol Manage

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Tropical peatlands release significant quantities of greenhouse gases to the atmosphere, yet the relative contributions of heterotrophic and autotrophic respiration to net CO 2 fluxes remains sparsely quantified. We used a combination of in situ trenching and vegetation removal in ex situ pots to quantify rootderived CO 2 under two plant functional types within a mixed species forest. Trenching significantly reduced surface CO 2 flux, indicating that approximately twothirds of the released CO 2 was derived from roots. In contrast, ex situ vegetation removal in pots indicated that root-derived CO 2 accounted for 27% of the total CO 2 flux for Campnosperma panamensis, a broadleaved evergreen tree, and 49% for Raphia taedigera, a canopy palm. The results show that root-derived CO 2 is a major contribution to net CO 2 emissions in tropical peatlands, and that the magnitude of the emissions is affected by plant species composition. This is important in the context of land use change driving alterations in vegetation cover.

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Effect of soil microorganisms and labile C availability on soil respiration in response to litter inputs in forest ecosystems: A meta‐analysis

Zhang

Zou

Meng

et al. 2020

Ecology and Evolution

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A new approach to trenching experiments for measuring root–rhizosphere respiration in a lowland tropical forest

Cited by 60 publications

References 37 publications

Total and heterotrophic soil respiration in a swamp forest and oil palm plantations on peat in Central Kalimantan, Indonesia

Total and heterotrophic soil respiration in a swamp forest and oil palm plantations on peat in Central Kalimantan, Indonesia

Root-derived CO2 flux from a tropical peatland

Effect of soil microorganisms and labile C availability on soil respiration in response to litter inputs in forest ecosystems: A meta‐analysis

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